This document is a supplement to the
Friden 130 Service Manual
to include information relating to the changes to the calculator as a
result of the "Three-Counter" design change.
Friden EC-130
serial numbers less than 8501
used the "Four-Counter" architecture, but at serial number 8501, some re-work
to the design was implemented to eliminate one of the counters to simplify the
machine without changing the functionality. The document is written
assuming that the reader is intimately familiar with the architecture
of the EC-130. Readers of this document that wish to be able to
understand it better are encouraged to read the Friden EC-130 Service Manual,
which provides detailed information on the logic of the calculator.
This document may not be redistributed without the watermark
indicating its source.
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